Introduction to SQL Indexes can usually be created for both primary and secondary keys. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to SQL What operator tests column for the absence of data? IS NULL operator EXISTS operator NOT operator None of these IS NULL operator EXISTS operator NOT operator None of these ANSWER DOWNLOAD EXAMIANS APP
Introduction to SQL The command to eliminate a table from a database is: UPDATE TABLE CUSTOMER; REMOVE TABLE CUSTOMER; DELETE TABLE CUSTOMER; DROP TABLE CUSTOMER; UPDATE TABLE CUSTOMER; REMOVE TABLE CUSTOMER; DELETE TABLE CUSTOMER; DROP TABLE CUSTOMER; ANSWER DOWNLOAD EXAMIANS APP
Introduction to SQL To establish a range of values, < and > can be used. False True False True ANSWER DOWNLOAD EXAMIANS APP
Introduction to SQL In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that: None of these all records meeting the full criteria are to be returned. all columns of the table are to be returned. all records with even partial criteria met are to be returned. None of these all records meeting the full criteria are to be returned. all columns of the table are to be returned. all records with even partial criteria met are to be returned. ANSWER DOWNLOAD EXAMIANS APP
Introduction to SQL Which of the following query finds the name of the sailors who have reserved at least two boats? SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND COUNT(r1.bid) > r2.bid All of these SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid <> r2.bid SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid ≠ r2.bid SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND COUNT(r1.bid) > r2.bid All of these SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid <> r2.bid SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid ≠ r2.bid ANSWER DOWNLOAD EXAMIANS APP
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